First of all, it is all Vanilla, no mods.

About the zombie

• It is 100% done if you are in a "local map", but I can not get it to stop despawning on a servermap.
  
• It can survive 3000 ticks under water, has fire protection 10 times higher than a normal zombie.
  
• Is faster, much faster
  
• It has a helth of 200 = 100 hearts
  
• It should have the active effect "stronger", but I can not see it.
  

I would love tips of how to create mobs with gears on a servermap.

For you that want to do the same/learn, use NBTExplorer and open my schematic to see what I have added.

Additional Notes

I will also add my "spawn" 100 zombies spawn cage, that will be next submission. And that one works in server :)